How to determine hole tolerance 1

[oonker]

I have a m10 bolt that is required for a new design on a part. How do I calculate the tolerance for the hole?

 

[DerbyLoco]

Without knowing the application it is difficult to give a definite answer but ISO 273 is the spec for clearance holes for ISO bolts and screws.

 

[ctopher]

The position, drill, or thread tolerance?
Check out ASME-Y14.5 and Machinery Handbook.

Chris
SolidWorks 11
ctopher's home
SolidWorks Legion

 

[drawoh]

oonker,

Here are my notes on hole tolerances...

http://home.eol.ca/~hgibson/tolerances.pdf

--
JHG

 

[ctopher]

drawoh,
Nice work!

Chris
SolidWorks 11
ctopher's home
SolidWorks Legion

 

[SeasonLee]

Here is a reference chart for metric screw assembly from Genium, hope this will help on your design.

Season

 

[oonker]

Thanks guys! I figured it out. Was having trouble making sure I had the right class of fit from the machinery handbook. Doubled checked with some of the guys here at work. Thanks for the charts too! They will be very handy I'm sure

 

[pmarc]

Out of curiosity, what is the reason that positional tolerance values specified in both Genium tables seem not to take MMC dimension of the through hole into account, but rather its nominal value?

 

[KENAT]

oonker, if I might caution over reliance on standard charts etc. As pmarc mentions some of them make assumptions that may not be relevant to your application etc. Some hole size charts don't explicitly take into account the location tolerance - the ones in machineries handbook are like that as I recall.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[drawoh]

pmarc,

I do not have the Genium manual. I do have Mechanical Design Handbook by Harold A. Rothbart, which has a similar table. This table claims the show the floating fastener case, but their calculations a for the fixed fastener case, and they have rounded their holes up to the next English drill size.

The principal is simple, and the calculations are easy.

--
JHG